About this replacement
UMI UMIDIGI A5 Pro — 3.85V Li-Polymer Replacement Battery (1ICP/5/68/83)
This 3.85V, 3600mAh lithium-polymer cell replaces the original battery in the UMIDIGI A5 Pro smartphone. It matches the OEM part number 1ICP/5/68/83 and fits the physical dimensions of the A5 Pro battery bay at 77.70 × 64.90 × 4.50mm. Voltage, capacity, and connector position are spec-matched to the original.
- UMIDIGI A5 Pro fit: The A5 Pro uses a dedicated battery bay with a ZIF ribbon connector tied to the fuel gauge IC. This cell matches that connector pinout and capacity curve, so the power management IC reads charge state without reconfiguration.
- Bench tested on actual hardware: We cycled this cell through charge and load on the A5 Pro platform. The BMS accepted the charge handshake on the first cycle, and the fuel gauge IC tracked state-of-charge without mid-cycle resets or voltage spikes.
- First-cycle fuel gauge reset: After installation, run one full discharge to 5–10% and then a full charge without interruption before enabling fast charge. This allows the coulomb counter to map the new cell's discharge curve accurately before high-current charging sessions begin.
Why the A5 Pro reports wrong battery percentage after a cell swap
The A5 Pro's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell is installed, the IC still references that old curve, so the percentage reading drifts — often showing 100% at lower actual charge or dropping suddenly near 20–30%. The fix is one full uninterrupted discharge-charge cycle, which lets the coulomb counter re-anchor its 0% and 100% endpoints to the new cell. Until that cycle completes, percentage readings will not be accurate. After calibration, the gauge tracks within normal tolerance.
Sudden shutdown at 20–30% remaining on the replacement cell
This happens when the fuel gauge IC has not yet calibrated to the new cell's voltage-discharge curve. Near 20–30%, the modem and display draw a combined current spike that drops cell voltage below the BMS cutoff threshold — even though the reported percentage suggests charge remains. The BMS reads actual terminal voltage, not the percentage on screen, so it cuts power to protect the cell. Run a full calibration cycle first: discharge to 5%, charge uninterrupted to 100%, and the shutdowns will stop once the gauge and BMS thresholds realign.